Small rounded bread or cake (3)
I believe the answer is:
bun
This clue is a double definition.
'small rounded bread' is the first definition.
(I've seen this before)
'cake' is the second definition.
(bun is a type of cake)
(Other definitions for bun that I've seen before include "Small rounded bread or cake" , "Small cake; hair style" , "Tied hair" , "A small cake, sweet and round" , "Kind of small round cake" .)